Boletín de aludes

East Slopes North

Northwest Avalanche Center
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Peligro de aludes

Tue
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Desactualizado: este boletín caducó 4 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

At higher elevations and in the western part of the zone near the Cascade Crest, dangerous avalanche conditions will likely develop during the day as the storm intensifies. Natural avalanche activity may peak Monday night - be sure to plan your return trip to match changing conditions. Wet loose avalanches are possible at lower elevations, especially in areas where snow turns to rain.  

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–2

    Dense wind-driven snow will pile up Sunday night and Monday, and increase again Monday night as a storm impacts the region. Look for increasing signs of instability as the day wears on; shooting cracks, whumpfs, or signs of natural avalanches in the new snow.   You'll find deeper and more consequential slabs growing on lee slopes in wind-affected terrain near Washington Pass and westward.  Strong WNW winds may form drifts further downslope of ridgelines than usual.   Where these conditions develop, avoid wind-loaded slopes steeper than 35 degrees.  With an increasing chance of natural avalanches late in the day, be aware of overhead hazard connected to larger slopes. 

    In more sheltered terrain, you may trigger shallow storm slabs that fail on the old snow surface or inter-storm layers.  You can steer around steep rollovers and unsupported slopes to avoid triggering a storm slab avalanche.  If avalanche conditions deteriorate more quickly than forecast, pivot to simpler and lower angled terrain at any elevation. 

    On steep lee slopes you can likely trigger a wind slab avalanche near and below ridgelines Monday. With strong winds forecast, wind slabs may form further downslope than usual. 

    Example photo: Irene Henninger

    (1/9/2023)

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–1.5

    The highest likelihood of triggering a wet loose avalanche will be in parts of the zone where new snow turns to rain Sunday night and/or Monday.  This will most likely be for areas closer to the Cascade Crest and west between 3000-5000' in elevation. 

    If you find yourself sinking in deeper than your ankle on any slopes or see signs of new or recent wet loose avalanche activity, shift to lower angled terrain.  Take extra care near terrain traps like cliff bands and exposed stumps and rocks where a small avalanche could do damage. 

    A wet loose avalanche on a steep road bank. Squilchuck Ck, E, 4,500ft Photo: Josh Hirshberg

Avalanche Discussion

On Sunday, avalanche professionals in the Washington Pass area reported moderate to strong ridgeline westerly winds transporting new and recent snow onto lee slopes.  New and shallow wind slabs (4-10") were developing and becoming increasingly sensitive as the day wore on.  Along some ridgelines, the winds were strong enough to scour down to the 2/12 crust (present up to about ~7000').   Prior to this, avalanche activity had been relatively limited dating back to the last avalanche cycle in this area between Feb 3-8th. 

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